Use single quotes where no variable interpolation is required.

.travis.yml

@@ -11,6 +11,6 @@ rvm:
 - 1.9.3
 - 2.0.0
 language: ruby
-before_script: "gem install --no-ri --no-rdoc bundler"
+before_script: 'gem install --no-ri --no-rdoc bundler'
 script: 'bundle exec rake validate && bundle exec rake lint && SPEC_OPTS="--format documentation" bundle exec rake spec'
 gemfile: Gemfile

Gemfile

@@ -1,4 +1,4 @@
-source "https://rubygems.org"
+source 'https://rubygems.org'
 
 puppetversion = ENV.key?('PUPPET_VERSION') ? "= #{ENV['PUPPET_VERSION']}" : ['>= 3.3']
 gem 'puppet', puppetversion

Rakefile

@@ -3,7 +3,7 @@ require 'puppet-lint/tasks/puppet-lint'
 PuppetLint.configuration.send('disable_80chars')
 PuppetLint.configuration.ignore_paths = ["spec/**/*.pp", "pkg/**/*.pp"]
 
-desc "Run puppet in noop mode and check for syntax errors."
+desc 'Run puppet in noop mode and check for syntax errors.'
 task :validate do
   Dir['manifests/**/*.pp'].each do |manifest|
     sh "puppet parser validate --noop #{manifest}"